NATURAL SCIENCES OF PHILADELPHIA. 435 



Descriptions of new Corals in the Museum of the Academy. 



BY GEO. H. HORN. 



Madrepora perampla. 



M. crasse foliata, frondibus profunde digitato-lobatis ; lobis late elongatis 

 (saepe 2' longis, 4" 8" latis, et 1" 4" crassis). Corallum infra, caliculis 

 confertis (1'" \\'" longis) ; supra tubiforrnibus, inequalibus (2'" 3'" longis 

 et \\'" latis) erectis, nunquani nariforrnibus ; Stella conspicuii, duabus 

 lamellis latioribus. 



The broad and thick lobes of this species distinguish it from either the M. 

 alcesor M. palmata. The calicles are elongated, and with a distinct 

 star. Immersed cells numerous, equalling in this respect the prominent 

 calicles. The lobes are broad, and arise from a common pedicle, which is 

 very stout (4" 6") ; they also show a tendency to further subdivision. 



Locality. West Indies. Dr. J. H. Slack. 



Madrepora subaquila. 



M. crasse digitata, (lobis 2' longis, 3" latis et 2J" crassis). Corallum infra 

 caliculis confertis (1" longis); supra tubiforrnibus, inequalibus (2'" longis et 

 V" latis); stella inconspicua. 



The above description was derived from a branch, two feet in length, of a 

 frond, whose mode of growth was nearly horizontal, judging from the relation 

 of the calicles to the upper surface. This species differs materially from any 

 of the digitato-palmate madrepores heretofore described, in its mode of 

 growth, its large calicles, and its inconspicuous star. Its color is light 

 brownish exteriorly. 



Locality. Unknown. 



Madrepora t u b i g e r a . 



M. prostrata, ramis paulum diffusis, stricte ramosis ; ramulis attenuati.s 

 (base 3'"), apice aeutis. Corallum porosum, caliculo apicale elongato, cylin- 

 drico (3'" 4'" saepe 5'" longo et '" lato) ; lateralibus tubiforrnibus, saepe 

 labellatis et dimidiatis ; stella conspicuii. 



This species is well marked. Its much elongated and delicate apical calicle 

 distinguishing it from all known prostrate branching madrepores. 



Locality. Unknown. Dr. T. B. Wilson. 



Merulina speciosa. 



M. explanato-ramosa, late undata ; margine lobata, unifronte ; superne 

 ramis confertis (2 3" altis). Corallum collibus rotundatis (1'" altis). 

 lamellis aequalibus serrulatis. 



This species differs from any other of the genus Merulina in its branches 

 arising from an explanate base. It grows in large subhemispherical clumps 

 (10" 13" in diameter). The thickness of the explanate portion is often 

 three lines. Its under surface is strongly ribbed, coarsely striate, and 

 granulous. 



Locality. Unknown. Dr. T. B. Wilson. 



Agaricia anthrophylla. 



A. late explanata, undata. Corallum margine fragile.* Buperficie infe- 

 riore striata ; superne laminis erectis (1 3" altis) coalitis et meandrinis 

 (saepe 8" longis) ; collibus elongatis et aequalibus (1 1%'" altis et latis) 

 lamellis crassis confertissimis. 



Grows in subhemispherical clumps, attached below by its centre. It differs 

 from the other Agariciae in its vertical and coalescing plates. The lamellae are 

 stout, being greater in thickness than the width of the spaces between them. 

 Corallum thin at the edges, interiorly measuring from three to five lines. 



Locality. Unknown. Dr. T. B. Wilson. 



i860.] 



